package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.CategoryDTO;
import com.sky.dto.CategoryPageQueryDTO;
import com.sky.entity.Category;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.CategoryMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.CategoryService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;

import java.util.List;

@Service
public class CategoryServiceImpl implements CategoryService {
    @Autowired
    private CategoryMapper categoryMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     *  新增分类
     * @param categoryDTO
     */
    @Override
    public void save(CategoryDTO categoryDTO) {
        Category category = Category.builder()
                .status(StatusConstant.DISABLE)
                .build();
        BeanUtils.copyProperties(categoryDTO, category);
        categoryMapper.insert(category);
    }

    /**
     *  分类信息分页查询
     * @param categoryPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(CategoryPageQueryDTO categoryPageQueryDTO) {
        //设置分页参数
        PageHelper.startPage(categoryPageQueryDTO.getPage(),categoryPageQueryDTO.getPageSize());

        //执行查询
        List<Category>  categoryList = categoryMapper.pageQuery(categoryPageQueryDTO);

        //封装结果并返回
        Page<Category> categoryPage = (Page<Category>) categoryList;
        return new PageResult(categoryPage.getTotal(),categoryPage.getResult());
    }

    /**
     * 根据类型查询分类
     *
     * @param type
     * @return
     */
    @Override
    public List<Category> getByType(Integer type) {
        return categoryMapper.getByType(type);
    }

    /**
     *  修改分类
     * @param categoryDTO
     */
    @Override
    public void update(CategoryDTO categoryDTO) {
        Category category = Category.builder().build();
        BeanUtils.copyProperties(categoryDTO, category);
        categoryMapper.update(category);
    }

    /**
     *  启用禁用分类
     * @param status
     * @param id
     */
    @Override
    public void startOrStop(Integer status, Long id) {
        Category category = Category.builder()
                .id(id)
                .status(status)
                .build();
        categoryMapper.update(category);
    }

    /**
     *  删除分类
     * @param id
     */
    @Override
    @Transactional
    public void delete(Long id) {
        //判断当前分类是否关联了菜品，如果关联了，则无法删除
        List<Dish> dishes = dishMapper.getByCategoryId(id);
        if (! CollectionUtils.isEmpty(dishes)) {
            throw new DeletionNotAllowedException(MessageConstant.CATEGORY_BE_RELATED_BY_DISH);
        }

        //判断当前分类是否关联了套餐，如果关联了，则无法删除
        List<Setmeal> setmeals = setmealMapper.getByCategoryId(id);
        if (! CollectionUtils.isEmpty(setmeals)) {
            throw new DeletionNotAllowedException(MessageConstant.CATEGORY_BE_RELATED_BY_SETMEAL);
        }

        //删除分类
        categoryMapper.deleteById(id);
    }
}
